Stuffing-box for engine-valves.



UNITED STATES PATENT OFFICE.

JOHN J. MACMULKIN, OF HUNTINGTON, NEW YORK, ASSIGNOR OF ONE-FOURTH TOHENRY U. PALMER AND ONE-FOURTH TO CHARLES A. SINGER, OF NEW YORK, N. Y.

STUFFING-BOX FOR ENGINE-VALVES.

To all whom it may concern:

Be it known that I, JOHN J. MACMULKIN, of Huntington, Long Island, acitizen of the United States, and a resident of Huntington, Long Island,in the county of Suffolk and State of New York, have invented certainnew and useful Improvements in Stufling- Boxes for Engine-Valves, ofwhich the following is a specification.

The present invention consists of certain new and useful improvements instutling boxes for engine valves, and relates especially to stufiingboxes for use in connection with inlet valves for gasolene engines.

The principal object of the invention is to provide a stutiing box inwhich the packing contained therein is constantly under pressure andwhich is adapted to be automatically compressed each time the valve isopened.

Other objects of the invention will be apparent from the followingdetailed description, pointed out in the claims, and illustrated in theaccompanying drawing.

In the accompanying drawing I have shown the invention in a longitudinalsectional view, a portionof the engine cylinder being also shown.

Referring to the drawing, 10 designates an engine cylinder provided withan inlet valve chamber 11 which communicates with said cylinder 10through a port 12.

A valve seat 13 is formed within the valve chamber 11 for a valve 14.Said valve 14 is provided with a stem 15. A guide sleeve 16 for the saidvalve stem 15 is located within the inlet valve chamber, and terminatesin a gland extension 17, which extends beyond one end of the said valvechamber.

A cup-shaped stufling box 18 is loosely mounted on the valve stem 15 ina position to receive the outer end of the gland extension 17. Saidstuffing box is provided with an outwardly extending abutment flange 19.

Within the stutling box suitable packing 20 is placed.

An abutment washer 21 is connected with the valve stem 11 by means of akey 22. Said abutment washer is provided with a seat 23 for one endportion of a valve spring 24 that is coiled around the valve stem 15between said abutment washer 21 and the abutment flange 19 of the on-shaped stuffing box 18.

The operation 0 the invention'is as follows :VVhen the inlet valve is inits normal, or closed position, as shown in the drawing,

Specification of Letters Patent.

Application filed March 10, 1908. Serial No. 420,138.

Patented Nov. 24, 1908.

it will be observed that, as the gland extension 17 is within thestufiing box 18 and hearing against the packing 20, a constant pressureis being exerted against said stufling box 18 by means of the interposedvalve spring 24. Now when the valve stem 15 is moved to open the valve14, the spring 2a will be compressed, and then such additional pressurewill be imparted to the stufling box, as to cause its packing to hammeragainst the gland extension, tending to compress and tighten the saidpacking. On the reverse movement of the valve stem, the spring assumesits normal, or distended position, but of course, retains the stufiingbox in a position where its packing will be in constant contact with thegland extension.

The invention is of special utility in connection with the inlet valvesof gasolene engines. In such structures it is essential that there benoleak around the valve stem that would permit air to enter the enginewhen the mixture is being admitted. In the present invention it will beseen that a structure has been produced in which the force of the valvespring is used to maintain a ti ht joint between the end of the glandand t e packing, and that as the valve stem is moved to open its valve,the packing will be hammered by the gland which causes a compression ofthe said packing, and such packing is retained in its compressed stateafter the valve has been closed by means of the constant pressureexerted by the valve spring against the stufling box. And'as the abovedescribed operation is performed each time the valve is opened, it willbe seen that an absolutely air-ti ht connection is maintained betweenthe stufhng box and gland.

I claim as my invention 1. A device of the character describedcomprising a valve chamber having a. valve therein, a stem for saidvalve projecting beyond said valve chamber, a spring-pressed stuffingbox mounted on the projected portion of said stem, and a gland for saidvalve stem mounted in said valve chamber and having an exteriorlyprojectin end portion that. extends into said stuffing mx.

2. A device of the character described comprising a valve chamber havinga valve therein, a stem for said valve which projects be ond said valvechamber, a gland in said va ve chamber surrounding said valve stem andhaving one end projected beyond the valve chamber, a washer carried bythe Signed at Huntin ton, in the county of projected end of the valvestem, a coiled and State of New ork, this 2nd day of ll) spring seatedon the washer, and a stuflin March A. D. 1908.

box loosely surroundin said stem and hel JOHN J. M ACMULKIN I inengagement with t e projected end of:

the gland by said spring, whereby a move- 5 Witnesses: ment of said stemcauses the end of the JOHN MILLIGAN, gland tocompress the packing insaid box. I E. V. REILLY.

